Shield or auxiliary wall for furnaces



1. 0. Games. SHIELD 0H AUXILIARYl WALL FOR FURNAVCES. V APPLICATON FILEDOCT. 25.1918. 1,32Q,386 Patented Nov. 4,1919.

4 SHEETS-SHEET 1.

L I MINIMUM L JEH '.i'l- "I l ULL' T4 i@ J; yHHHHHHHHHHHHHHH;HHHHHHHHHH'HHIHHHHHH J. 0x GRIGGS. SHIELD 0H AUXLLLARYWALL FOR FURNACES.

APPLICATION FILED OCT. 25. 1918.

Patented N ov. 4,1919.

4 SHEETS--SHEET 2 QNL J. o. GRIGGS. SHIELD 0R AUXILIARY WALL FORFURNACES.

l APPLICATION FILED OCT. 25. 1918. 1,820,386.

4 SHEETS-SHEET 3.

Patented N ov. 4, 1919.

J. O. GRIGGS. SHIELD OR AUXILIARY WALL FOR FURNACES.

APPLICATION FILED OCT. 25. I9I8.

Patented Nov. 4, 1919.

4 SHEETS-SHEET 4 i iaosc. i i

unirsi) s'rATEs Arun nieren.

JOHN o. sarees, or rEoRIA, ILLINOIS.

SHIELD 0R AUXILIARY WALL FOR FURNACES.

`Specification of Letters Patent;

Patented Nov. a, 19M);

Appncauonpaleaoctober 25,1918. serial No. 259,683.

To all whom t may concern: y

Be it known thatvI, JOHN O. Guides, .a

citizen of the United States, aresident of Peoria, in the county ofPeoria andState of Illinois, have invented new and useful Im-Iprovements in Shields or Auxiliary Walls for Furnaces, of `which thefollowing is a specification. n n This invention has reference tomovable shields or auxiliary walls for the back-wall of. an open hearthfurnace. y I j The invention has for its principal object to `permit thereplacement cfa back-wall of an openhearth furnace without interruptingthe operation of the furnace, and this is accomplished by providing onefor more,

`portion has fallen in.

preferably, vertically. movable auxiliary wall sections, which may belowered into position to take the place of a. Wall which has fallen induring the course of a heat,and thus protect the heat against freezingor retardation; and which may also be used as a shield to protectworking -men against the extreme` heat while replacing a back-Wallersection thereof..

That the invention may be more fully understood, reference is` hadtothe. followingdrawings, inwhichrm` `Figure l is a rear `elevation of anopenhearth furnace, partly broken away, with ,my` invention appliedthereto;

'Fig 2 is an enlarged detail, in elevation, showing my backfwall shieldor` auxiliary Wall' Fig. 3 is a plan view ofFig. 2;

Fig. 4 is a view partly in end elevation and partly in vertical section,the line o f section being taken on the line 4-4 of Fig; 2;

Fig. 5 is a cross-section through a 4furnace, `showing my inventionapplied to the rear wall;

. 'Fig 6 is Van elevation of the mechanism for raisingl and lowering theshields `or auxiliary walls; H y p Fig. 7 is a cross section through afurnace showing my invention applied as a substitute for the rear wallof thefurnace;` y Fig. 8,` is a horizontal section taken on `the line 88 of Fig. 7, and p x p Y Fig. 9 is a horizontal section taken on-theline 8-8 `of Fig. 7 but showing the invention applied to theV baclr`wall inwhich,"a

Like characters of reference denote cor'- responding parts throughoutthe figures.

It is awelllnown fact,` that :during the operation of` anopen-hearthfurnace, the back-wall will fall in, or it becomes necessaryto replace a baclwall because of deterioration. If the bacl-wall fallsin durlng a heat, it is the practice to shut down the. furnace andpermitit to cool suiiiciently to permit the workers to-replace the backwall,andthis takes, usually, from five to twenty-four hours, Vand the heatfreezes or retards, as it becomes necessary to shut the gas olf,entailing considerable loss, not only in the amount of time necessaryfor the `furnace to cool, but also in the time necessary to reheat themetal, which, when once frozen or solidified, is not an easy matter toremeltand often requires from twenty to thirty-six hous to reheat it.

To prevent the baclrwall falling in, .while a heat is in progress, it isthe custom to make an ,approximates estimate of the life of the wall,and if in the judgment of the operator,

the wall may fall in during a heat, he will shut down the furnacebetween heats," tear outthe back-wall and replace it.

Myinventionobviates the foregoing danger of the heat freezing orretarding, should the wall fall in, and also Iobviates the necessity ofshortening the life of the wall byprematurelytearing it down, permittingit to befused until completely gone, or it falls in, thel shield orauxiliary wall being lowered into place to serve as a wall, and alsoserving to protect the working men during thel rebuilding of the wall.

While the invention is intended primarily for use-'on open hearthfurnaces, itis `applicable to other furnaces of like construction, andLtherefore, do not wish to `be limited to its use on open hearthfurnaces.

l In the drawings, A designates the usual open hearth furnace, havingthe back-wall B, and C designates thefbuck-stays, preferably arranged Yin pairs slightly spaced `vapartan'd upon opposite sides of ,panels D.vThe upper ends of the buck-stays C channel-beams E.

Adapted to slide up and down inthe panels D and between the buck-staysC,

`are connected to longitudinallyV arranged end Walls 5. In this casingthere is built up a front Wall of brick 6, or other lire resisting orrefractory material, which lies in juxtaposition to the rear furnaceWall B, or acts as a substitute Wall. for it, or takes its place whensaid `wall falls in; or is torn down for replacement, on account ofdeterioration of said back-Wall.

Arranged longitudinally of and in spaced relation on the rear Wall 2 ofthe shield, are two pairs of roller tracks 7, made up of a plurality ofrollers 8, the spindles 9 of which are secured in the Wall 2, and alsoin plates 10, the latter serving as guides for frames 11 which areadapted to be moved back and forth on the rollers 8. Hinged on theframes 11 are arms 12, which, at their outer ends have a hingedconnection with straps 13 secured to Wings 14. These 'Wings are of thesaine general construction as the main shield 1; that is to say, theyare formed With a back-Wall 15, top and bottom Walls 16, and end Walls17, and being in the form of a casing have a filling of lire brick 18,or other re resisting or refractory material.

Normally, the frames 11are Withdrawn so that the Wings 14 are disposedon the rear of the shield and do not project beyond the end Walls 5thereof. In this arrangement the shield is normally supported above thepanel D and between a pair of buck-stays C. When the shield is to beused for protecting a deteriorated panel, or in case a portion thereofhas fallen in, the shield is lowA ered to the position shown in Figs. 5and 9 in Which position the shield closes or covers any break in thepanel and permits the heat to go on. The shield is held in this positionto protect a bad portion'in the back Wall or a break therein Which isnot suliciently large to endanger the buck-stays. When the shield withits wings, is used for protecting aback- Wall, which has fallen in andthe shield and its wings is to serve as a substitute Wall to protect theheat against freezing or retardation and the Workingnien during` 'therebuilding of the back-Wall B the shield is lowered from its raisedposition in case it is being supported above the panels, or in case itis being held in the position shown in Figs. 5 and 9, it is then pushedinto the chamber of the furnace to permit the Wings 14, to be movedbehind the buck-stays; the frames 11 are moved to the ends of the shieldand the Wings are carried out over the end Walls 5 of the shield, Withone end Wall 16 of each Wing 14 abutting against `an end wall 5 of theshield, as shown in Figsl, 2, 3, 7 and 8. In this position of the Wings14 ythey are behind the buck-stays C, and the adjoining shields 1, andWings 14 form a continuous Wall over as many panelsI D, as may bedesired, protecting the buck-stays C against the intense heat, and theWorking nien while they replace the back-Wall B.

The pivotal connection of the arms 12 with the fra-Ines 11,4 and thepivotal connection between said arms 12 and straps 13 on the Wings,permits of the necessary adjustments to place the Wings on the back ofthe shield or extended beyond the ends of the shield, as shown.

Any suitable mechanism for raising and lowering the shields 1, may beemployed, as desired, but I have preferred to show sections of chains 19coupledto the shields l, andsaid chain sections in turn coupled tocables 20, which travel up and over sheave wheels 21 joumialed in frames22 secured to the beams E.

In the present arrangement one cable 2O is Wound on a drum 23, and theother cable 20 is Wound on va drum 24. Both drums are provided With gearWheels 25 meshing With pinions 26 on shafts 27 arranged to have a crank2S placed thereon for operating the saine. On each drum shaft is carrieda ratchet Wheel`29, the teeth of which are adapted to be engaged by apavvl 30 for looking the drums with the shields 1 elevated Withvdifferent positions. The raising and lowering mechanism may be arrangedon one end of a furnace, or the furnace equipped with such a mechanismat both ends, if desired.

The drawings show the wings 14 at each end of the shield', in pairs oneabove'the other, and While it is preferable and desirable to so`construct the Wings, they may be made as one Wing for each end of theshield. Making the Wings at each end of the shield iii pairs, it isprovidedl that ias the shieldis raised, during the reconstruction ofthelback Wall, the upper pair of Wings may be folded back against theshield, so that there may be no interference from obstructions at theroof of the furnace" behind the buck-stays.

lNhat I `claim is j Y v 1. In a device ofthe character described, incombination with a furnace Wall, a shield applied directly to said Wallto covera deteriorated or fallen portion thereof topi-event freezing orretardation of the heat.

2. In a device of the character described, in combination with a furnaceWall, a shield applied directly to said Wall to cover a deteriorated orfallen portion thereof to prevent freezing or retardation of the heat,and Vmeans for moving said shield over the Wall surface.`

3.` In ak device of the cliaracterdescribed, in combination with afurnace Wall, a shield ap lied directly to said Wall to cover adeteriorated or fallen portion thereof to prevent ,freezing orretardation of the heat, and lWings for saidy shield adapted to be movedbeyond each end thereof to increase the length of theshield.

4. In a device of the character described,

` in combination with a furnace Wall, a shield applied directlytiosaidiwall to cover a deteriorated or 4fallen porti-on thereof toprevent freezing or'retardation of the heat, wings-.for said shieldadapted to be moved beyond each end thereof to increase the length ofthe shield, and means for moving said shieldandwings over-the wallsurface.

'5. In a device of the character described, in combination with afurnace wall, a shield applied directly to said wall to cover adeteriorated or fallen portion thereof to prevent freezing orretardation of the heat, wings for each end of the shield, and means forpivotally supporting said wings on the shield, whereby the wings may bewithdrawn behind the shield, or` moved beyond the ends of the shield tolengthen the same.

6. In a device of the character described, in combination with a furnacewall, a shield applied directly to said wall to cover adeteriorated orfallen portion thereof to prevent freezing or retardation of the heat,wings for each end of the shield, means for pivotally supporting saidwings on the shield, whereby the wings may be Withdrawn behind theshield, or moved beyond the ends of the shield to lengthen the'same, andmeans for moving said shield and wings over the wall.

7. In a device of the character described, in combination with a furnacewall, a shield applied directly to said wall to cover a demoved beyondthe ends of the said shield to lengthen the same, and means for movingsaid shield and wings over the wall surface.

9. In a device of the character described, in combination with a furnacewall, a shield to cover a deteriorated or fallen portion of said wall toprevent freezing or retardation of the heat, a plurality of tracks onsaid shield, frames slidable on said tracks, plates having a pivotalconnection with said frames, wings for each end of said shield, and apivotal connection between said wings and said plates. j

10. In a device of the character described, in combination with afurnace wall, a shield to cover a deteriorated or fallen portion of saidwall to prevent freezing or retardation of the heat. plurality of trackson said shield, frames slidablc on said tracks, plates `having a pivotalconnection with said frames, wings for each end of said shield, apivotal connection between said wings and Vsaid plates, and means formoving said in combination with a furnace wall having buck-stays, ashield lying adjacent the wall and between said buck-stays, wings foreach end of said shield, said wings adapted to be moved beyond the endsof the shield -and behind said buckstays to lengthen said shield, andmeans for elevating and lowering said shield and wings.

13. In a device of-the character described, in combination with afurnace wall having buck-stays dividing the wall into a series ofpanels, a shield between each pair of buck-stays7 and lying adjacent thewall, and a separate means for elevating and lowering each shield.

14. In a device of the character described, in combination with afurnace wall having buck-stays dividing the wall into a series ofpanels, a shield between each pair of buck-stays and lying adjacent thewall, a wing extension for each end of each shield, means for soconnecting said wings to the shields that they may be moved beyond theends of the shields to lengthen the same and form a continuous auxiliarywall, and a separa-te means for elevating and lowering each shield.

15. In a device of the character described, in combination with afurnace wall, a shield to cover a deteriorated or fallen portion of saidwall to prevent freezing of the heat, the face of said shield lyingadjacent said wall, at least one face thereof being made of a fireresisting or refractory material.

16. In a device of the character described, in combination wit-h afurnace, a portable shield for replacingthe back wall of the furnace, atleast one side of the shield being composed of fire resisting orrefractory ma terial.

17. In a device of the character described, in combination with afurnace and its buckstays, a portable shield having lateral extensionsfor replacing the back wall of the furnace, and protecting itsbuck-stays.

1S. In a device of the character described, in combination with afurnace, a portable back wall movable as a unit and having al' least oneface composed of fire resisting or refractory material. j

19. In a device of the character described, the combination with afurnace wall, a shield made'of a multiplicity of sections and adapted tocover zt deteriomted or fallen to cover a deteriorated or tellen portionof portion of Said Wall to prevent freezing Suid Wall to preventfreezing or retardaor retardation of the heat. v tion of the heat.

I 20. In a device of the character described, In Witness whereof, havehereunto afl0 5 in combination with L furnace Wall, a ixedmy hand this21st day of October, 1918.

Shield made of folding sections and adapted JOHN O. GRIGGS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. it.v

